Table 4 Relation between antioxidant activity measurements of 3 AH polyphenols using different methods to evaluate the antioxidant activities of isolated compounds from Acacia hydaspica

DPPH^·

NA

–

–

NO^·

y = 1.3736x + 3.7351

R² = 0.9993

NA

–

OH^·

y = 0.7411x + 3.5321

R² = 0.9301

y = 0.5354x + 1.5528

R² = 0.9165

NA

TAC

y = − 0.0666x + 1.7807

R² = 0.9264, p < 0.01

y = − 0.0481x + 1.9586

R² = 0.9124

y = − 0.0901x + 2.0993

R² = 0.9999

FRAP

y = − 41.969x + 680.02

R² = 0.8271

y = − 30.177x + 790.87

R² = 0.8073

y = − 59.277x + 896.42

R² = 0.9742